Walter J. Buckhorn examines field cage on ponderosa pine Dendroctonus brevicomis Lec. brood trees. Prineville, Oregon.
Photo by: F.P. Keen
Date: May 27, 1932
Credit: USDA Forest Service, Pacific Northwest Region, State and Private Forestry, Forest Health Protection.
Collection: Bureau of Entomology Collection; La Grande, Oregon.
To learn more about this photo collection see:
Wickman, B.E., Torgersen, T.R. and Furniss, M.M. 2002. Photographic images and history of forest insect investigations on the Pacific Slope, 1903-1953. Part 2. Oregon and Washington. American Entomologist, 48(3), p. 178-185.
For more about W.J. Buckhorn see:
Furniss, M.M., 2000. Walter Julius Buckhorn (1899–1968)—Legendary Forest Entomologist, Not of the Classroom Kind. American Entomologist, 46(3), pp.133-140.